Chemically polished polycrystalline alumina material

Details Chemically polished polycrystalline alumina material Chemically polished polycrystalline alumina material

1975-06-25

1977-07-05

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 30E, 65 31, 65116, 156665, C03L 1500

Patent

active

040337430

ABSTRACT:
Increased optical transmission is provided for a body of light transmissive polycrystalline alumina body treated at elevated temperatures with a molten flux composition. A tube of the flux polished material which can be used as the light transmissive envelope for high intensity discharge lamps especially sodium vapor lamps, improves light output from the lamp as the result of increased in-line transmission for the treated envelope member. A method of chemically polishing polycrystalline alumina material in this manner is also disclosed.

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